There are usually a set of terms and words assimilated from other languages that are common and standard.

(I am talking about Afrikaans(Dutch kinda). We use a lot of English, French and other language words and terms.)

You should be able to get a list of these commonly used words and terms rather than using a complete English Dictionary and use that list to check if the word exists.

The drawback is that someone will have to maintain this table of words. Usually the Language institute or Universities have lists like that.

Good Luck
Ian